Art of preparing plastic compounds.



wire ATES- PATENT FFICE.

CARL REISSER, OF STUTTGART, GERMANY.

ART OF PREPARING PLASTIC COMPOUNDS.

SPECIFICATION forming part of Letters Patent No. 685,460, dated October29, 1901.

Application filed February 25, 1901.

To all whom it may concern.-

Be it known that I, CARL REISSER, a citizen of the Empire of Germany,residing at Stuttgart, in the Empire of Germany, have invented certainnew and useful Improvements in the Art of PreparingPlastic Compounds;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

The present invention relates to the art of preparing plastic compounds,and in particular compounds having the appearance of plaster-of-paris,the object being to provide a mass of a considerably less specificgravity than plaster-of-paris and which is much less fragile and is forthis reason particularly adapted for preparing therefrom models andcasts for educational purposes-for example, in connection with drawingclasses-and also for ornamental purposes for adorning the interior andexterior of buildings and the like.

The models hitherto used in schools for free-hand drawing and also themoldings and stucco ornaments extensively employed in the building artsare all open to the objection that they are very heavy and are veryeasily fractured and destroyed and must therefore be handled with aconsiderable amount of care.

By virtue of the present invention I am enabled to provide a mass of lowspecific gravity of great resisting powers and which at the same timehas the appearance of plasterof-paris and which is particularly Welladapted for the purposes above indicated.

In order to fully disclose my invention, I will now describe in detailthe preferable manner in which I carry the same into practice.

I take about two parts of the form of sulfate of lime known as alabasterand about one part of chemically pure whiting or chalk sennnaisnoe. (Nospecimens.)

directly formed by pouring or transferring the same in suitable molds.

It is to be noted that I do not use the term gelatinous solution in itsbroad sense of including solutions of the soluble silicates. On thecontrary, it is to be understood that by the term gelatinous solution Iintend to include solutions only of those organic substances resemblingglue or gelatin, this being the sense in which the term gelatinoussolution is ordinarily employed. I find that the models, casts, orornaments formed in this manner are very strong and resisting, so thateven delicate ornaments and open fretted work may be produced which isalmost unbreakable. Models and casts made from this mass areparticularly adapted for educational purposes, because they embody allof the advantages of plastic casts without the disadvantagesaccompanying them, as hereinabove set forth. The decorative moldings,stucco ornamentations, and other articles for buildings are alsoexceedingly well adapted for mural and ceiling decorations, since theymay be nailed to the Walls, &c., and are very light and durable.

It is evident that other articles may be made from the above-describedmass. It is also manifest that the proportions above given may be variedwithin considerable limits without departing from the gist of thepresent invention, which is more particularly pointed out in the claimshereunto annexed.

What I claim, and desire to secure by Letters Patent, is

1. The process of preparing plastic compositions for models, casts andmural decorations, which consists in adding a salt of calcium to agelatinous or glue solution and thereupon adding to the mixture thusformed a fibrous material.

2. The process of preparing plastic compositions for models, casts andmural decorations which consists in first making a mixture of differentsalts of lime, then adding this mixture to a gelatinous or gluesolution, and thereupon adding a fibrous material. I

8. The process of preparing plastic compositions for models, casts andmural decorations which consists in first mixing a sulfate of lime withanother salt of lime, then add ing this mixture to a gelatinous or gluesolution, and thereupon addinga fibrous material.

4. The process of preparing plastic compositions for models, casts andmural decorations which consists in first mixing two parts of a sulfateof lime with one part of a carbonate of lime, then adding this mixtureto a gelatinous or glue solution, and thereupon adding a fibrousmaterial to the mixture.

5. The process of preparing plastic compositions for models, casts, andmural decorations which consists in adding a mixture of alabaster andwhiting to a gelatinous or glue solution and thereupon adding to themixture thus formed fibrous material.

6. The process of forming plastic com position for models, casts andmural decorations which consists in adding a mixture consistingsubstantially of two parts of alabaster and one part whiting to a gluesolution, stirring and warming the same until a thin liquid mass isformed, and then adding sufficient Vegetable fiber to form a semiliquidor pasty mass.

'7. The process for forming plastic composition for models, casts, andmural decorations, which consists in adding a mixture consistingsubstantially of two parts alabaster and one part chemically purewhiting to a solution of French hare-skin glue, warming and stirringuntil a thin liquid mass is formed and then mixing this solutionwithvegetable fiber until a semiliquid or pasty mass is formed.

8. A compound free from silicates, for the manufacture of models, casts,mural decorations and the like, said compound containing a salt ofcalcium in combination with a gelatinous substance and fibrous material.

9. A compound free from silicates, for the manufacture of models, casts,mural decorations and the like, which consists of a mixture of gypsumwith a gelatinous substance and vegetable fibrous material.

10. A compound for the manufacture of models, casts and muraldecorations and the like which consists of a mixture of alabaster andwhiting in combination with a gelatinous substance and fibrous material.

11. A compound for the manufacture of models casts and mural decorationsand the like which consists of a mixture of substantially two parts ofalabaster with chemically pure whiting combined with French hareskinglue and vegetable fiber.

In testimony whereof I affix my signature in presence of two witnesses.

CARL REISSER.

Witnesses:

A. DRAUTZ, IIE. REICI-IARDT.

